Re: [Engine-devel] [UX] how to design a bar/line chart?

On Nov 12, 2013, at 11:18 , Tomas Jelinek <tjelinek(a)redhat.com&gt; wrote: > So we have looked into the resource usage sampling with mbetak and also with Michal and it seems that > > for the CPU usage: > - VDSM polls libvirt to get the runtime statistics of the VM regularly. The pooling interval is configured in > vdsm.conf as vm_sample_cpu_interval and by default it is 15 seconds > - libvirt returns something we than use to calculate the average CPU usage since the last poll > - engine polls VDSM once in 15 seconds to get the current statistics (the same 15 seconds is just a coincidence and we can not count on this) > - than the frontend polls the engine each 5-60 seconds (depends on the refresh rate) and gets the current value from the engine > - the user can press the refresh button anytime to poll the engine again > > For network usage: > - it should be pretty much the same as the CPU just the VDSM poll interval is configured as vm_sample_net_interval and by default it is 5 seconds Dan, since we poll only every 15s and cpu info is 15s wouldn't it make sense to change the default for network monitoring to 15s as well? it's 2 libvirt rounds trip for nothing really. Or does it serve some other purpose?